Replace s_init() early initialization at the end of lowlevel_init
by invoking the same code in mach_cpu_init(). The mach_cpu_init()
is called a bit later, but as the code initializes timer and no
code uses timer until mach_cpu_init(), this does not pose a problem.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Remove DECLARE_GLOBAL_DATA_PTR from files where gd is not used, and
drop the unnecessary inclusion of asm/global_data.h.

Headers should be included directly by the files that need them,
rather than indirectly via global_data.h.

Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com> #STMicroelectronics boards and STM32MP1 ram test driver
Tested-by: Anshul Dalal <anshuld@ti.com> #TI boards
Acked-by: Yao Zi <me@ziyao.cc> #TH1520
Signed-off-by: Peng Fan <peng.fan@nxp.com>

struct bd_info is defined in asm-generic/u-boot.h. Include it to avoid
building error after asm/global_data.h are removed from this file.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

Clean up to avoid more reset macro duplication.

Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Implement custom U_BOOT_FIT_LOADABLE_HANDLER and armv8_switch_to_el2_prep()
handling in case the TFA was loaded. The loadables handler sets up custom
handoff structure used by Renesas TFA fork in fixed location in DRAM and
indicates the TFA has been loaded.

The custom armv8_switch_to_el2_prep() handling tests whether the TFA BL31
was previously loaded and the custom handoff structure was set up, and if
so, jumps to TFA BL31 which switches from EL3 to EL2 and then returns to
U-Boot just past bl in armv8_switch_to_el2() to finish starting the Linux
kernel.

The jump to Linux through TFA works in such a way that the custom
armv8_switch_to_el2_prep() handler configures the custom handoff structure
such that the target jump address of the TFA BL31 on exit is set to the
armv8_switch_to_el2() + 4, which is just past the bl, and just before the
U-Boot code which implements the Linux kernel boot from either EL. The
registers passed through the TFA BL31 are all the registers passed into
armv8_switch_to_el2_prep() to assure maximum compatibility with all the
boot modes. The armv8_switch_to_el2_prep() handler jumps to the TFA BL31,
which does its setup, drops EL from EL3 to EL2 and finally jumps to the
armv8_switch_to_el2() + 4 entry point, which then allows U-Boot to boot
the Linux kernel the usual way.

In order to build suitable kernel fitImage, build TFA first, upstream
is currently under review:
https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/35799
Or if necessary, downstream repository:
remote: https://github.com/renesas-rcar/arm-trusted-firmware.git
branch: rcar_gen4_v2.7_v4x

```
$ git clean -fqdx
$ MBEDTLS_DIR=/path/to/mbedtls/ make -j$(nproc) bl31 \
	PLAT=rcar_gen4 ARCH=aarch64 LSI=V4H SPD=none \
	CTX_INCLUDE_AARCH32_REGS=0 MBEDTLS_COMMON_MK=1 \
	PTP_NONSECURE_ACCESS=1 LOG_LEVEL=20 DEBUG=0 \
	ENABLE_ASSERTIONS=0 E=0
```

Build Linux kernel Image and device tree from current mainline Linux
kernel repository, obtain 'Image' and 'r8a779g0-white-hawk.dtb' .

Bundle the files together using provided fit-image.its fitImage description:
```
$ mkimage -f fit-image.its fitImage
```

To start the kernel fiImage generated in previous step, load fitImage
to DRAM and use the 'bootm' command to start it:
=> load 0x58000000 ... fitImage && bootm 0x58000000

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Rename directory board/renesas/rcar-common to board/renesas/common and
move files. This allows the build system to use HAVE_VENDOR_COMMON_LIB
which automatically includes board/$(VENDOR)/common/Makefile . Create
temporarily empty board/renesas/common/Makefile to be extended with
actual content later in this series. This is a preparatory patch for
board Makefile simplification. No functional change so far.

Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>